package com.gqj.common.utils.uuid;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class HiultraUtil {
    private static long orderNum = 0l;
    private static String date;

    /**
     * 生成编号
     *
     * @return
     */
    public static synchronized String getOrderNo() {
        String str = new SimpleDateFormat("yyMMddHHmm").format(new Date());
        if (date == null || !date.equals(str)) {
            date = str;
            orderNum = 0l;
        }
        orderNum++;
        long orderNo = Long.parseLong((date)) * 10000;
        orderNo += orderNum;
        return orderNo + "";
    }

    /**
     * date2比date1多的天数
     *
     * @param date1
     * @param date2
     * @return
     */
    public static int differentDays(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);

        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        int day1 = cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);

        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);
        if (year1 != year2) // 不同一年
        {
            int timeDistance = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) // 闰年
                {
                    timeDistance += 366;
                } else // 不是闰年
                {
                    timeDistance += 365;
                }
            }

            return timeDistance + (day2 - day1);
        } else // 同一年
        {
            return day2 - day1;
        }
    }

    //计算两数变化
    public static double countNumChange(double currentQuantity, double lastQuantity) {
        if (lastQuantity == 0 && currentQuantity == 0) {
            // 两个数量都为0的情况
            return 0;
        } else if (lastQuantity == 0) {
            // 上次数量为0的情况，当前数量不为0
            return 100;
        } else if (currentQuantity == 0) {
            // 当前数量为0的情况，上次数量不为0
            return -100;
        } else {
            // 正常情况
            double percentage = (currentQuantity - lastQuantity) / lastQuantity * 100;
            return percentage;
        }
    }
}
